DE2830236A1 - TENSION CLAMP AND PROCEDURE FOR ITS OPERATION - Google Patents

Description

DIPL. ING. HEINZ BARDfHLE DIPL. CHEM. DR. PETER FÜRNISS

PATENT LAWYERS

File number:

Applicant _: Marshall and Williams Company

46 Baker Street Providence, Rhode Island

UNITED STATES.

Munich,

S / la

Our sign:

P 2735

Tension clamp and method of actuation.

909821/0442

Office: Herrnatraße 15, Munich 33

ORIGINAL INSPECTED

The invention relates to a tension clamp and a method for their operation. It relates in particular to a tension clamp with a gap and in particular to a new, novel mechanical one Movement of the jaw, creating the edge or rope tape of a plastic film that lies behind the jaw when the Baking in the closed or gripping position is through a lifting movement of the jaw is released from the gripping position.

Split-type tension clamps have a jaw that rotates about a pivot pin or tenon. The jaw has an upright lever which is actuated by a cam to place the jaw in the open position and pivots under the action of gravity to the closed or gripping position.

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A plastic film is made in a tenter or frame machine, which consist of two parallel, spaced endless chains with numerous individual tension clamps, which are pivotally connected to each other by heat softened and stretched sideways.

During the stretching process, the thickness of the film is reduced before baking and before the opposing baking. The film that lies behind the baking and is unaffected by the stretching process remains three to ten times thicker and stiffer than the stretched film. This is an edge or an ointment. At the exit or discharge of the machine the pivoted jaw is actuated by a cam so that it pivots into the open position.

When the jaw begins to pivot backwards, He pushes back the edge portion of the film by removing the bead created in the film by the stretching process was seized. Knives separate the direct film from the edge. The edge will be a band of waste material that is winds in the tenter or around parts of the tenter and prevents the jaw from pivoting freely. So much for the state of the art.

The invention is therefore based on the object of this undesirable Eliminate condition.

This is done according to the invention through the subject matter of the claims .

According to the invention, there is provided a gap type clamping jaw with a new, novel movement, which is moved from an open to a set position and from a closed to an open position.

Furthermore, it is achieved according to the invention that a tension clamp jaw is placed in a position where it is artificially cooled during the cycle in which it does not grip.

Another advantage of the invention is that the

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Service life of the gripper jaw edge and the base plate increased as well the speed at which the gripping jaw edges are moved into and out of the gripping position is increased.

Another advantage of the invention is that the gripping jaw edge placed in a position where it will be cleaned during the cycle in which it does not act and a replacement the edge of the gripper jaw is easily possible.

Further purposes, features and advantages of the invention will be apparent from US Pat following description of preferred embodiments in conjunction can be seen with the figures.

In the figures, the same parts are provided with the same reference numerals.

Fig. 1 is a front elevational view of the new, improved tension clamp;

Fig. 2 is a central vertical section taken along line 2-2 in Fig. 1; Fig. 3 is a rear view;

Fig. 4 is a right side view;

Fig. 5 is a view similar to Fig. 2 showing the jaw edge in gripping engagement with the base plate;

Fig. 6 shows the gripping jaw edge in the position in which it is under the action of the longer cam arm releases the material;

Fig. 7 shows the gripping jaw edge in an upper, raised Position in which it is under the action of the shorter cam arm away from the base plate;

Fig. 8 shows the gripping jaw edge in the position in which it is under the action of both the longer and the shorter

Cam arm picks up material;
Fig. 9 is a horizontal cross section taken along 9-9 in Fig. 2; Fig.io is a plan view of Fig. 1;

11 is a schematic view of a tenter or frame machine showing the location of the cams that make up the Jaws lifting housing arm, and actuating the gap extension;

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Figure 12 shows the cam and cam follower for the tension clamp gap;

Figure 13 shows the cam follower for the jaw lifting housing arm.

As can be seen from the figures, the new, improved tension clamp has a horizontally arranged base frame 1o a horizontal clamping surface 11 and a pair of parallel upright, spaced-apart arms 12, 12 a, which are at the top above the horizontal clamping surface 11,

and are each provided with sprues 13, 13a. A bracing arm 12 b, which extends from the base frame 1o upwards, is attached to the arms 12, 12 a and has a Slot 12 c. A crossbar 15 is integral with the stiffener arm 12 b and the arms 12, 12 a connected and v / eist a recess 15 a with a stop surface 15 b.

There are sprues or hubs 13, 13 a with liners 16, 16 a (see Fig. 9). A pin 17 is rotatably mounted at opposite ends in the bushings 16, 16 a and is held therein by means of a washer 8 and a hook snap ring 7. An eccentric sleeve 2o with a highest point

20 a and a low point 2o b is rotatably mounted on the pin 17. A jaw lifting housing 21, which is generally round in shape, is provided with a stop 22 and a gate 23, which has an opening 24 which has a threaded surface 25 and has a stop system 25 a (see. All figures). The housing 21 has a centrally located bearing 26 which the can accommodate eccentric sleeve 2o. A Backenhubgehäusearm 27 with a cam follower end 28 and a threaded surface 3o, the ends in a nipple end 31 is due to the engagement of the threaded surfaces 25, 3o, with the nipple end 31 (see FIG. 7), which passes through an opening 32 in the eccentric sleeve 2o and sits against the pin 17 on the jaw lifting housing

21 attached. In this way, the jaw lift housing 21 is both

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attached to the eccentric sleeve 2o as well as to the pin 17, so that the cam actuation of the Backenhubgehäusearms 27 the pin 17 in the liners or threaded linings 16, 16 a pivots. The stop 22 against which the cross bar 15 abuts (see FIG. 8) limits the pivoting movement of the housing 21.

The tension nip, which is generally designated by the reference numeral 4o, _we has a body 41 with a cutout 42, thereby forming two parallel vertical upright, spaced-apart legs 43 located, 43 are formed a top of the body 41st Bearings 39, 3 9 a, which are each formed in the spaced legs 43, 4 3 a, are mounted on the eccentric sleeve. A threaded gate 46 is integrally formed in the body 41. A generally vertical slot 47 is provided in the lower portion of the body 41. A tensioning clamp jaw, indicated generally by the reference numeral 48, has a lower or knife edge 49 or a shoe 50 and an upwardly projecting arm 51 /. ^A mne head screw 52 with a nut 53 and a locking washer 54 connects the arm 51, which is mounted in the slot 47, pivotably to the body 41 (see FIG. 2). However, the clamp jaw 48 may be an integral part of the clamp gap 40 and not be pivotable.

A jaw protrusion or shoulder 8o having a screw thread 81 and a cam follower 82 is by means of the screw thread 81 is attached to the threaded sprue 46 and thus becomes an integral part of the tension clamp gap 4o. Of the Cam follower 82 is shown rotatably mounted in a socket 83, which by means of washers 84, 84 a and hook snap rings 85, 85 a is attached to the projection 8o (see FIG. 2). The cam follower 82 may be an integral, non-rotatable part of the protrusion 8o.

Generally designated by the reference numeral 6o base (see. Fig. 2) comprises a body in the form of a C with a vertical wall 61, a voltage applied to a guide rail surface 62

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has an upper arm 63 and a parallel lower arm 64 on. A roller chain, which is fastened on both sides to the base part 6o, has roller band members 65, 65 a and 66, 66 a, the spacer sleeves 67, 67 a, 68, br, w. 68 a are attached. Rollers 7o, 71 are each between spacer sleeves 67, 67 a or 68, 68 a attached. Pivot bolts or pins (not shown) connect the roller 7o, the spacer sleeves 67, 67 a and the roller binding leather 65, 65 a rotatable with the upper arm 63 and the lower arm 64. Likewise, pivot pins (not shown) connect the roller 71, the Spacer sleeves 68, 68 a and the roller links 66, 66 a with the upper arm 63 and the lower arm 64.

The horizontally arranged base frame 1o has an edge 79 on. The frame 1o is arranged on the upper arm 63, the edge 79 abutting the surface f-2. Screws 78 go through openings in the horizontally arranged base frame 1o are attached and are of (not shown) Screw threads, which are arranged in the upper arm 63, are rotatably gripped and thereby hold the tension clamp 1o to the Base part 6o down and connect it to it. The base part 6o can be an integral part of the base frame 1o.

Reference is now made to FIG. 11, in which a schematic view of a tensioning or frame machine is shown, which is provided with the tensioning clamp according to the invention is.

The usual tensioning or frame machine has four gears 1oo, 1o1, 1o2 and 1o3, respectively on waves 1o4, 1o5, 1o6 and 1o7, which are aligned with two pairs of parallel endless chains 1o8, 1o9 consisting of numerous pivotally connected tension clamps are formed.

A jaw lowering housing cam 11o at the beginning end and a tension clamp split cam 111 at the beginning end are on the frame of the conventional clamping or frame machine attached. A jaw lift housing cam 11o a at the exit end and a tension clamp gap

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cams 111 a at the output end are attached to the frame of the usual tensioning or frame machine. Both sets of cams at the input end and at the output end are mounted in such a working position that they actuate the respective cam followers on the tension clamps which form the endless chain 1o8. In the same way, cams 11o, 111 and 11o a , 111 a are provided on the frame of the tensioning or frame machine for the endless chain 1o9.

In operation, the tension clamps that form the two endless chains 1o8, 1o9 ^ to the input end of the frame or Tenter (first zone), with the lower edge or the shoe 5o in a position above and outside the vertical Alignment with the clamping surface 11 is (see FIG. 8).

While the tension chain 1o8 passes around the gear 1oo in the direction of arrow A, the terminals in de are: r ⁿ FIG position illustrated. 8 The clamp is ready to be moved from the rest position to the working position. While the circulating chain passes the cam 111, the cam follower 82 grips the cam 111 and lifts the projection 8o upwards into the uppermost position, whereby the shoe 5o is brought into vertical alignment with the clamping surface 11, as shown in FIG. Then the cam follower 28 seizes the cam 11o and rotates the jaw lift housing arm 27 upwards and the eccentric sleeve 2o from the apex position 2o a into the lowest point position 2o b, so that the stop system 25 a rests on the stop surface 15 b, whereby the clamping jaws 48 move downwards Distance to the clamping surface 11 is brought, as shown in FIG. The further rotation of the chain causes the cam follower 82 to let go of the cam 11 so that the clamping jaw 48 falls into the clamping position by gravity, the shoe 5o resting against the clamping surface 11, as shown in FIG. The same sequence of movements takes place simultaneously with the clamps of the chain 1o9, so that a web is gripped on opposite edges by the clamps in the chains 1o8, 1o9 and is conveyed by the frame or tensioning machine to the exit end.

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When the clamps in the chain 1o8, 1o9 the cam 11o a and 111 a (second zone) approach, the cam follower 82 grips the cam 111 a and rotates the jaw lift projection 8o down into the position shown in FIG. 8, whereby he puts the shoe 5o out of the clamping position with the clamping surface 11 rotates or pivots. At the same time, the cam follower 28 grips the cam 11o a and rotates the eccentric one Sleeve 2o from the lowest point position 2o b into the high point position 2o a. The clamping small gap 4o is then in the position shown in FIG. 8, in which the knife edge or the shoe 5o can be artificially cooled or, of course, during the idle movement of the clamp from the exit end to the input end of the frame or stenter to complete the cycle just described.

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Claims (1)

Claims 1. tension clamp, characterized in that it consists of a base plate (1ο) with a clamping surface (11) / a Pair of arms (12, 12a), an eccentric sleeve (2o) with a highest point (2o a) and a low point (2o b), pivotally mounted between the pair of arms, a jaw lift housing (21) with a jaw lift housing arm (27) having a cam follower (28), wherein the jaw lift housing mounted on the eccentric sleeve (2o) and attached to it, a tension clamp gap (4o) from a Body (41) with a lower edge (49), a projection (8o) with a cam follower (82) and a device that pivotally supports the tension clamp gap (4o) on the eccentric sleeve (2o). · 2. tension clamp, characterized in that it consists of a base frame (1o), with a clamping surface (11), a Pair of arms (12, 12 a) with bearings (13, 13 a) over the clamping surface, a cross bar (15) between the pair of arms with a stop surface (15 b), a pin (17), which is mounted in the bearings, an eccentric sleeve (2o) with a highest point (2o a) and a low point (2o b), which is mounted on the pin, a jaw housing (21) with a centrally arranged bearing (26), a stop (22) and a stop system (25), which are attached to the eccentric sleeve, a jaw lift housing arm (27) with a cam follower (28) protruding from the jaw lifting housing, a device (25, 3o, 31, 32) which the jaw lifting housing and the eccentric sleeve attached to the pin (17), a tension clamp gap (4o), which consists of a 909821/0442 Office: Herrnstrasse 15, Munich 3a Body (41) with a cutout (42) to form two spaced legs (43, 43 a) at the upper end of the body, and a rib roit a lower edge (49) at the bottom of the body, bearings (39 , 39 a) ₍ which are formed in the legs located at a distance from one another and are arranged on the eccentric sleeve for independent rotary movement, a jaw projection (8o) with a cam follower (82) protruding from the tensioning clamp gap (4o), whereby a Downward movement of the jaw projection causes the bottom edge (49) to be moved in the material clamping position with the clamping surface (11) and whereby the pivoting movement of the gap (4o) lifts the bottom edge (49) away from the clamping surface (11), whereby the stop against the crossbar (15) and the highest point (2o a) is above the lowest point (2o b) and a downward movement of the jaw projection (8o) moves the bottom edge (49) out of alignment with the clamping surface (11). Tension clamp, characterized in that it consists of a horizontally arranged base frame (1o) with a Clamping surface (11), a pair of parallel vertical, spaced-apart arms (12, 12 a) with bearings (13, 13 a) which are above the clamping surface, and a stiffening arm (12 b) with a slot (12 c) and one Cross bar (15) which is attached to the base frame and the arms located at a distance from one another, a pin (17), which is mounted in the bearings, an eccentric sleeve (2o) which is mounted on the pin, a jaw lifting housing (21) with a centrally arranged bearing (26), a sprue (23) and a stop (22) on the eccentric sleeve is attached, a Backenhubgehäusearm (27) with a cam follower, which is from the Jaw lift housing protrudes, a device (25, 3o, 31, 32) which attaches the jaw lifting housing and the eccentric sleeve to the pin, ! Ul 9 8 2 1 / Π 4 U 2 a tension clamp gap (4o) from a body (41) with a cutout (42) for generating two parallel upright legs (43, 43 a) at a distance from one another at the upper end of the body, and a horizontal rib with a slot (47) on the lower part of the body, bearings (39, 39 a), which in the legs located at a distance from one another are formed and are mounted on the eccentric sleeve, one Clamping clamp jaws (48) with a lower edge (49) and an arm (51), a screw device (52,53), the the arm located in the slot is attached to the rib, a jaw projection (8o) with a cam follower (82), which protrudes from the tension clamp jaw, whereby, when the lower edge (49) is in the material-receiving position, causes the upward movement of the jaw projection (8o), that the lower edge is moved in the material clamping position with the clamping surface (11) and with a rotary movement of the jaw lift housing arms (27) lifts the lower edge away from the clamping surface and a downward movement of the Jaw projection (8o) pivots the lower edge (49) out of alignment with the clamping surface (11), wherein, when the lower edge is in the material-receiving position and the stop (22) is against the crossbar (15) and the jaw lift housing arm (27) is controlled by cams so that it has the maximum point (2o a) above the The lowest point (2o b) and the projection is brought into an uppermost position by cam control, the lower one Edge against the clamping surface (11) in the material gripping position moved, while the Jaw lift housing arm (27) is controlled by cams so that it moves the jaw lift housing (21) pivots to the lowest point (2o b) in position above the To bring the highest point (2o a). Method for actuating a tension clamp in order to alternately grip an edge region of a material web and while holding the web in a position for movement by a frame or tensioning machine and the web after the Movement through the frame or tensioning machine is free again 909821 / 0U2 give, characterized in that one a) the tension clamp with a clamping surface that can be actuated in this way is to hold an edge portion of the web in engagement and provide a clamping device so operable is that it comes into contact with the web edge area in order to clamp the edge area onto the clamping surface when the Tension clamp is in the first zone, b) the tensioning clamp is moved by the frame or tensioning machine from the first zone to a second zone, around the web respectively, c) raises the clamping device to a first position which is generally perpendicular to the surface when the Tension clamp In the second zone of the tension frame is moved ^ in order to release the track part from the clamping handle between the clamping device and the surface, d) then moves the clamping device to a second position which is generally horizontally outside the surface is arranged while the clamping device is held raised above the surface, e) then moves the tensioning clamp into the first zone of the tensioning frame in order to pick up another web edge part, f) aligns the other part of the web edge with the surface, g) moves the clamping device from the second position into the first position and h) thereafter releasing the clamping device for movement on a generally perpendicular path onto the surface, to clamp the further edge portion between the clamping device and the surface and thereby the web in Hold position while the web with the further edge moves from the first zone to the second zone of the tenter frame emotional. A method according to claim 4, characterized in that the clamping device is further raised above the surface while the clamping device is lifted from the first position to the second position 909821 / 0U2 is moved. 6. The method according to claim 4 or 5, characterized in that
that the surface and the clamping device are actively cooled,
when the clamping device is in the second position. 7. The method according to any one of claims 4 to 6, characterized in, reacting the clamping device from engagement with the first edge portion to the first and second positions actuated on the movement of the tension clamp from the first zone to the second zone. 8. The method according to any one of steps 4 to 7, characterized in that the clamping device is moved from the first and second position into the position in which it touches the further web edge
clamped in response to movement of the tension clamp actuated from the second zone to the first zone. 9. The method according to any one of claims 4 to 8, characterized in that that a second tensioning clamp is disposed opposite the tensioning clamp, around an edge of the web corresponding to that of the tension clamp is opposite to the edge of the web that is gripped, wherein the second tensioning clamp is operated in synchronism with the tensioning clamp to alternate the opposite web edge to seize and release. 909821 / 0U2